define(["dojo/_base/declare","esri/layers/tiled"], function(declare){
return declare(esri.layers.TiledMapServiceLayer, {
        constructor: function() {
          this.spatialReference = new esri.SpatialReference({ wkid:4326 });
          this.initialExtent = (this.fullExtent = new esri.geometry.Extent(-180.0, -90.0, 180.0, 90.0, this.spatialReference));
 
          this.tileInfo = new esri.layers.TileInfo({
            "rows" : 256,
            "cols" : 256,
            "compressionQuality" : 0,
            "origin" : {
              "x" : -180,
              "y" : 90
            },
            "spatialReference" : {
              "wkid" : 4326
            },
            "lods" : [
              {"level" : 2, "resolution" : 0.3515625, "scale" : 147748796.52937502},
              {"level" : 3, "resolution" : 0.17578125, "scale" : 73874398.264687508},
              {"level" : 4, "resolution" : 0.087890625, "scale" : 36937199.132343754},
              {"level" : 5, "resolution" : 0.0439453125, "scale" : 18468599.566171877},
              {"level" : 6, "resolution" : 0.02197265625, "scale" : 9234299.7830859385},
              {"level" : 7, "resolution" : 0.010986328125, "scale" : 4617149.8915429693},
              {"level" : 8, "resolution" : 0.0054931640625, "scale" : 2308574.9457714846},
              {"level" : 9, "resolution" : 0.00274658203125, "scale" : 1154287.4728857423},
              {"level" : 10, "resolution" : 0.001373291015625, "scale" : 577143.73644287116},
              {"level" : 11, "resolution" : 0.0006866455078125, "scale" : 288571.86822143558},
              {"level" : 12, "resolution" : 0.00034332275390625, "scale" : 144285.93411071779},
              {"level" : 13, "resolution" : 0.000171661376953125, "scale" : 72142.967055358895},
              {"level" : 14, "resolution" : 8.58306884765625e-005, "scale" : 36071.483527679447},
              {"level" : 15, "resolution" : 4.291534423828125e-005, "scale" : 18035.741763839724},
              {"level" : 16, "resolution" : 2.1457672119140625e-005, "scale" : 9017.8708819198619},
              {"level" : 17, "resolution" : 1.0728836059570313e-005, "scale" : 4508.9354409599309},
              {"level" : 18, "resolution" : 5.3644180297851563e-006, "scale" : 2254.4677204799655}
            ]
          });
 
          this.loaded = true;
          this.onLoad(this);
        },
 
        getTileUrl: function(level, row, col) {
            return "http://t" + row%8 + ".tianditu.cn/cva_c/wmts?SERVICE=WMTS&REQUEST=GetTile&VERSION=1.0.0&LAYER=cva&STYLE=default&TILEMATRIXSET=c&TILEMATRIX="+level+"&TILEROW="+row+"&TILECOL="+col+"&FORMAT=tiles";
   
          }
      });
      });